Method and device for the winding of elastic threads



July 11, 1950 BOUCRAUT 2,514,691

METHOD AND DEVICE FOR THE WINDING 0F ELASTIC THREADS Filed Nov. 2a, 1946 Patented July 11, 1950 METHOD AND DEVICE FOR THE OF ELASTIC THREADS WINDING Louis Boucraut, Troyes, France, assignor to Societe a responsabilitelimitee La Maill Souple,

Paris, France Application November 26, 1946, Serial No. 712,318 In France November 22, 1945 The" employment of elastic threads and especially threads of covered rubber, has so'far been made hard owing to the fact that these threads, that are reeled-with a more or less uneven tension, leave the spool in a series of jerky motions when being unwound and reach the spot where they are to be used sometimes slack and sometimes unduly stretched.

What happens is that the woven material manufactured out of this covered rubber contains rubber threads of uneven tension that cause the Section 1, Public Law 690, August 8, 1946 Patent expires November 22, 1965 3 Claims. (01. 242-45) 1 When the tension of the thread increases, the ring is drawn upwards and strikes against the lever that closes the control circuit for the engagement of the drum; the drum commences to spin at high speed, it draws the thread from the feed-spool and feeds it in the direction of the ring at a muchhigher rate than the working speed. At this juncture, the tension becomes less and the ring comes down again until the lever has swung in the opposite direction and thus actuates the release and the consequent pulling formation of hollows and lumps in the fabric and militate against an attractive appearance.

The object of the present invention is to obviate the foregoing disadvantages. To this end,

itaims at a method of unwinding and feeding elastic threads that includes the placing between the feed-spool and the working loop of a device that provides a low and steady tension in place of the highly erratic pull on the thread. The'invention also has for its object a device for the operation of the above mentioned method. This device comprises a drum with a completely smooth facing on which the thread, as it leaves the feed-spool, is coiled up with several extra windings. Between this drum and the working loom a reserve stock of thread is arranged under the form of a free length of thread tensioned in the shape of a V by a light floating weight that, on the one hand, regulates the steady low tension demanded and on the other hand, controls the checking or free-running of the drum, according as the height of the V made by the thread becomes less, under the influence of an increase in tension of the thread, or becomes greater through a lessening of this tension caused by a pull of the thread on the feed-spool by the checked drum.

From a practical point of view, the floating weight may consist of a ring that is set to slide freely along an upright guide-rod; at a fixed position in its travel this ring strikes against a member that controls the checking or free-running of the drum; this member is for instance, in the form of a swinging lever and constitutes a switch in an electric circuit used for the checking or release of the drum. In accordance with one method of execution of the device in line with the invention, the checking and release are secured by means of an electro-magnet the armature of which comes into action for changing the position of the loosely mounted drum on its axis urging one side of the drum into frictional engagement with the side of a pulley that is keyed on the same axis and driven continually by the loom.

up ofthe drum. 7

A method of execution of the device in accord-" ance with the invention is illustrated as an example in the accompanying drawings:

' Figure l is a diagrammatic elevational view of this device.

Figure 2 is a plan view corresponding to Figure 1.-

The elastic thread I unwound from the spool 2 2 passes over a guide 3 and is coiled in several turns on a light drum 4, then it goes through the ring 5 that may travel freely up and down the vertical slide-way 6, then through a lead 1 and it is then drawn along 8 towards its working position. A perforated scale, that is not shown in the diagrammatic drawing, keeps each turn of thread apart on the surface of the drum in order to avoid any over-riding tendency. When this drum is idle, the loom draws the thread and takes up the available stock of thread that forms the V between 4 and 1. If the tension of the thread increases, the ring 5 is pulled upwards and strikes against the end of the small lever 9, that swings around pivot H]; the other end of this lever drops, thus making the contact at I I.

The contact ll energizes the electro-magnet I2 that attracts the end of a lever I3, swinging around pivot I4, while the other end of the lever l5 urges the drum 4 against the pulley l6 that is furnished with a leather washer I1; this pulley I6 is revolved continually by a belt I8 from the loom.

The pulley It drives then in its turn the drum 4 that draws the elastic thread from the spool 2, at a speed much above working speed; this thread is fed to the ring 5 that immediately sinks down along its slideway rod 6, while moving away from lever l3. The latter, swinging, breaks the contact I I; the electro-magnet I2 is no longer energized and releases the lever [3; the drum 4 draws away from the pulley l6 and ceases rotatmg. As soon as the reserve stock of thread between 4 and I is again used up, the same procedure carries on and another stock is made up.

The thread thus is kept under a tension corre-v sponding to the weight of the ring and accordsaid switch under the control of the vertical V cation of the ring.

ingly is fedzto the loom under steady tension; that may be aslow-as desired, since it dependsisolely on the weight of the ring.

What I claim is:

1. In a device for unwindingiand" .ieedingfl.

threads and more particularly threads of Jcoveredw elastic rubber from a feed spool on to a working loom, the combination of a looselyirotatable and:

transversely shiftable drum arranged-' -between the spool and loom and over which the thread is means for shifting the drum into and out of fricadapted to be coiled through severalturns, driv-u ing means for the drum operable from2the loom;

tional engagement with the driving-"means,"*a

light weight adapted to act on the threadbetween the drum and the loom, and to assume a 161 81 1111;

accordance with the length of the floating stock of threaduexisting, between-the drum .and ,100m

and; .means controlling. the ,shifting of. the drum: in accordance.- with thelevel. assumed by: the.

lightweight.

2L,.In. .ai device, for unwinding and feeding threads. andmore. particularly threads of, covered elasticprubberafrom a ,feed spool V on to a working loom; thecombinationiotadooselyrotatable and transversely? shiftable drum. arranged between,

the. spoolandtheloom and over which the thread is adapted to 1 be coiled, throughseveral turns, driving means for the drum, means for. shifting the. drum intowandrout of. engagement withthe drivingimeans, a, ring engaging the thread be--- tween the. drum, and the loom, a substantiallyverticalnrodr over which,said ring is slidingly mounted for assuming a level corresponding, to

thelength, of floating stock of thread existing between the drum and'loom, an electric circuit, a switch in said circuihuandi a lever controlling 3.vIn: a'-' deVi'ce "-f0r unwinding:- and: feeding threads and moreeparticularlyzthreads of covered elastic rubber from a feed spool on to a working "loom, the combination of a loosely rotatable and trolling; said. switch vand v positioned-adjacent ther verticalirod and in thepath ormovement ofithew ring seas to=be, automatically operated by thes;

ring; v.-

LOUISFBOUCRAUT.

REFERENCES CITED Thei fo'11owing. references; are of record: in itl'ie filez of this patent :2:

UNITED STPSIIEZE, PATENTS Number Name Date.

1,475,855 Murdock; :Nov.2!7,1923 1,950,105.? Faure-Roux' Mar. 6,19341 2,042,481 Patterson; .d June 2,193.6; 2,306,660 Gift Dec. 29, 1942 2,31%};070; Bogoslowsky Mar. 16, 1943 2; 328;322 Besthold. .{Aug. 3l;(19.43-

2401982 Springh0rn;i J ,une. 1-11, 

